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LTC3770 Datasheet

  • LTC3770

  • Synchronous Controller with Margining, Tracking and PLL

  • 302.90KB

  • 24頁

  • LINER

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LTC3770
Fast No R
SENSE
TM
Step-Down
Synchronous Controller with
Margining, Tracking and PLL
FEATURES
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DESCRIPTIO
Wide V
IN
Range: 4V to 32V
鹵0.67%
0.6V Reference Voltage
Output Voltage Tracking Capability
Programmable Margining
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t
ON(MIN)
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100ns
Phase Lock Loop Frequency Synchronization
Powerful Dual N-Channel MOSFET Driver
Adjustable Cycle-by-Cycle Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Current Foldback Protection (Disabled at Start-Up)
Output Overvoltage Protection
Micropower Shutdown: I
Q
< 30碌A
Power Good Output Voltage Monitor
Tracks the Reference Input Pin
Available in (5mm
脳
5mm) QFN and 28-Lead
SSOP Packages
The LTC
廬
3770 is a synchronous step-down switching
regulator controller with output voltage up/down tracking
capability and voltage margining. Its advanced functions
and high accuracy reference are ideal for powering
high performance server, ASIC and computer memory
systems.
The LTC3770 uses a constant on-time, valley current
mode control architecture to deliver very low duty factors
without requiring a sense resistor. The operating fre-
quency is selected by an external resistor and is compen-
sated for variations in input supply voltage. An internal
phase-lock loop allows the IC to be synchronized to an
external clock.
Fault protection is provided by an overvoltage comparator
and input undervoltage lockout. The regulator current limit
is user programmable. A wide supply range allows volt-
ages as high as 32V to be stepped down to as low as a 0.6V
output. Power supply sequencing is accomplished using
an external soft-start timing capacitor.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. No R
SENSE
is a trademark of Linear
Technology Corporation. Protected by U.S. Patents including 5481178, 5487554, 6580258,
6304066, 6476589, 6774611.
APPLICATIO S
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Distributed Power Systems
Server Power Supply
TYPICAL APPLICATIO
0.01碌F
PGOOD
MARGIN
10k
PLLFLTR
PLLIN
0.1碌F
I
ON
V
IN
TG
SW
0.22碌F
CMDSH-3
68k
High Efficiency Step-Down Converter
V
IN
5V TO 28V
Si4884
1.8碌H
10碌F
35V
V
OUT
x3
2.5V
10A
180碌F
4V
x2
Efficiency and Power Loss vs Load Current
100
V
IN
= 5V
95 V
OUT
= 2.5V
90
EFFICIENCY
10
EFFICIENCY (%)
85
80
75
70
65
60
POWER LOSS
TRACK/SS
BOOST
I
TH
+
1000pF
10k
LTC3770
SGND
RUN
V
ON
V
RNG
V
REFOUT
INTV
CC
DRV
CC
BG
SENSE
+
V
OUT
Si4874
10碌F
B340A
95.3k
55
50
0.01
0.1
1
LOAD CURRENT (A)
0.01
10
3770 TA01b
10k
V
REFIN
MPGM
82k
SENSE
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PGND
V
FB
3770 TA01
30.1k
U
POWER LOSS (W)
1
0.1
U
U
3770f
1

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